Mehod and device for forming cigarette filter rod

Abstract

A method and device for forming a cigarette filter rod. The method is as follows: in a process of continuously conveying forward cigarette filter materials that tend to converge to have a rod shape, multiple granular additives are continuously output in accordance with a certain time interval, and are sprayed into the cigarette filter materials that converge forwards under the action of continuous transporting flows, so that after the cigarette filter materials converge to form a continuous filter rod, multiple groups of additive unit combinations formed of different granular additive units are embedded in an axial direction of the filter rod. With the method and device for forming a cigarette filter rod, a filter rod containing multiple granular additives can be formed in one step; multiple granular additives can be combined and arranged in any way along an axial direction of the filter rod; dosage positions and intervals of various granular additives can be adjusted and changed randomly; a production process is simplified and the production cost is reduced.

Description

BACKGROUND OF THE PRESENT INVENTION[0001]1. Field of Invention[0002]The present invention relates to the manufacturing filed of tobacco, and particularly to a forming method and a forming device for a cigarette filter.[0003]2. Description of Related Arts[0004]In order to filter some certain of hazardous substances (such as nicotine, tar) of cigarette smoke, the vast majority of current cigarettes are provided with filter rods. The filter rod is produced by a filter rod forming machine, e.g., the KDF2 filter rod forming machine produced by Hauni Company, Germany. The machine generally consists of two parts of a tow pretreatment section (AF) and a filter rod forming section (KDF), the coming cellulose acetate tows are the continuous fiber tows having been compressed and packaged, then the fiber tows is continuously fed into the machine; during the tow pretreatment process, the cellulose acetate tows are opened and expanded to a relative loose and board fiber band, which is sprayed wit...

AI Technical Summary

Benefits of technology

The present invention provides a method for forming a cigarette filter rod with smooth and steady conveying of feedstock, and high-speed manufacture. The method allows for addition of multiple granular additives during the manufacture process. The filter rod can contain different combinations of granular additives, which can be adjusted and changed randomly. This method simplifies production and reduces costs while improving the quality and production efficiency of the filter rod. The device for forming a cigarette filter rod uses stable continuous transporting airflow for accurate and uniform dosage of granular additives.

Problems solved by technology

In such production method, the granular additives are sprayed to the filter material by adopting pulse flows, while pulse flows are discontinuous, and it requires for duty time between two sprays, which makes it difficult to carry out high-speed production.

The device absorbs feedstock by vacuum, thus granular additives are likely to block the vacuum system that leads to shortage of material; besides, reliability of feedstock is reduced during high-speed operation, thereby causing shortage of material.

It improves the difficulty of machining when adopting matched sealing surfaces to form a pressure system, and granular additives directly touch with the sealing surfaces, which is likely to cause pressure sealing failure.

Moreover, the above two devices for forming filter rob feature a common shortcomings, that is, during the process of forming filter rob, it is generally added with just one type of granular additive, thus, the produced filter rob contains one type of granular additive as well, in such way, the function of a cigarette filter rod is limited.

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